[PATCH v4 2/5] doc: glossary: update per-worktree refs

[Andy Koppe <andy.koppe@gmail.com>]

The "per-worktree ref" entry says that only HEAD and refs under
"refs/bisect/" are per-worktree, but that has been out of date since
a9be29c981 (sequencer: make refs generated by the `label` command
worktree-local, 2018-04-25). All root refs are per-worktree, as are refs
under "refs/worktree/" and "refs/rewritten/". Pseudorefs are specific to
each worktree too.

Bring the list up to date, and state that it will not be extended, as
new per-worktree refs are meant to go under "refs/worktree/" since
8aff1a9ca5 (Add a place for (not) sharing stuff between worktrees,
2018-09-29).

Signed-off-by: Andy Koppe <andy.koppe@gmail.com>
---
 Documentation/glossary-content.adoc | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/Documentation/glossary-content.adoc b/Documentation/glossary-content.adoc
index 1d737cae1d..0ce1701937 100644
--- a/Documentation/glossary-content.adoc
+++ b/Documentation/glossary-content.adoc
@@ -494,10 +494,27 @@ exclude;;
 	interface than the <<def_plumbing,plumbing>>.
 
 [[def_per_worktree_ref]]per-worktree ref::
-	Refs that are per-<<def_worktree,worktree>>, rather than
-	global.  This is presently only <<def_HEAD,HEAD>> and any refs
-	that start with `refs/bisect/`, but might later include other
-	unusual refs.
+	A <<def_ref,ref>> that is specific to a <<def_worktree,worktree>>,
+	rather than shared between all worktrees. All <<def_root_ref,root refs>>,
+	for example <<def_HEAD,HEAD>> and `ORIG_HEAD`, are per-worktree, as are
+	refs with the following prefixes:
++
+--
+ - `refs/bisect/`
+
+ - `refs/rewritten/`
+
+ - `refs/worktree/`
+--
++
+This list will not be extended in future. Any new per-worktree refs shall be
+created under `refs/worktree/`.
++
+Even though they are not refs, <<def_pseudoref,pseudorefs>> are also
+specific to each worktree.
++
+See "REFS" in linkgit:git-worktree[1] for how to access the
+per-worktree refs of other worktrees.
 
 [[def_pseudoref]]pseudoref::
 	A name that can be used like a <<def_ref,ref>> to refer to an
@@ -787,5 +804,5 @@ See linkgit:gitrevisions[7] for descriptions of commonly used root refs.
 	"working tree" and repository metadata, most of which are
 	shared among other worktrees of a single repository, and
 	some of which are maintained separately per worktree
-	(e.g. the index, HEAD and pseudorefs like MERGE_HEAD,
-	per-worktree refs and per-worktree configuration file).
+	(e.g. the index, <<def_per_worktree_ref,per-worktree refs>>, and the
+	per-worktree configuration file).
-- 
2.56.0